Aptian–Albian paleophytogeography and paleoclimatology from Northeastern Brazil sedimentary basins

Souza-Lima, Wagner; Silva, Rafael Oliveira

doi:10.1016/j.revpalbo.2018.08.003

Cited by 14 publications

(5 citation statements)

References 75 publications

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“…However, identifying the spores and pollen grains of the parent plant classified at the family level is often challenging. This study referred to the literature (e.g., Dino, 1994;Carvalho, 2004;Souza-Lima and Silva, 2018;Jansonius et al, 1976Jansonius et al, -1996 to identify the botanical affinities of the indicator species.…”

Section: Bioclimatic Analysismentioning

confidence: 99%

Late Aptian paleoclimate reconstruction of the Brazilian equatorial margin: inferences from palynology

Cardoso da Silva Giannerini,

de Araujo Carvalho,

Cunha Lana

et al. 2023

Clim. Past

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Abstract. This study conducted high-resolution paleoclimatic analyses based on the identification of palynological groups of late Aptian age (biozone Sergipea veriverrucata) in the Bragança and Codó formations within the Bragança–Viseu, São Luís, and Parnaíba basins. The analysis comprised 40 palynological samples, with 200 palynomorphs per slide counted when possible. Bioclimatic analysis was mainly supported by the identification of botanical affinities, and ecological and climatic parameters such as the wet/arid trend (Fs/X), Shannon–Wiener diversity, and indicator species analysis (IndVal) were used. Statistical analyses such as principal component and cluster analyses were employed to support the paleoclimatic interpretations. The study recognized 69 genera distributed among the main groups of living plants, including bryophytes, ferns, lycophytes, gymnosperms, and angiosperms. It was possible to attribute botanical affinity in 94.2 % of the taxa, and nine genera occurred in all sections studied: Afropollis, Araucariacites, Callialasporites, Cicatricosisporites, Classopollis, Cyathidites, Deltoidospora, Equisetosporites, and Verrucosisporites, with Classopollis being the most abundant. The stratigraphic distribution of the bioclimatic groups (hydrophytes, hygrophytes, lowland tropical flora, upland flora, and xerophytes) allowed for the identification of climatic phases: pre-evaporitic, evaporitic, and post-evaporitic. In the pre-evaporitic phase, the most significant abundances were between the hygrophytes and upland flora, indicating a certain level of humidity. Xerophytes were the most abundant in all phases, with a conspicuous increase in the evaporitic phase, reflecting an increase in aridity. In the post-evaporitic phase, there was a significant increase in the upland flora with the return of wetter conditions. This study confirmed an increasing humidity trend in the analyzed sections, probably owing to the influence of the Intertropical Convergence Zone that was already operating during the late Aptian.

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Section: Bioclimatic Analysismentioning

confidence: 99%

Late Aptian paleoclimate reconstruction of the Brazilian equatorial margin: inferences from palynology

Cardoso da Silva Giannerini,

de Araujo Carvalho,

Cunha Lana

et al. 2023

Clim. Past

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“…Similarly, the APP diagram implies dysoxic-anoxic conditions for the upper part of PF-2A (i.e., uppermost Alam El Bueib, Alamein, and Dahab formations); however, the geochemical data indicates oxic conditions. The later conditions are related to possible bioturbation of the deltaic shale and oxidation of AOM in Sample 12, which is commonly known to downgrade HI values TABLE 2 Botanical affinities, ecological preferences, and paleoclimatic indications of some selected sporomorphs in tropical and subtropical regions (modified after Deaf, 2009;Souza-Lima and Silva, 2018;Deaf et al, 2020a).…”

Section: Interpreted Paleoenvironmentmentioning

confidence: 99%

“…This is explained by the appearance and common abundances of the hot climate indicators Classopollis pollen grains in the upper part of PF-2A (Samples 11-15) (Figure 3; Table 2). High abundance of these hot xeric pollen grains is indicative of hot dry climatic conditions (Doyle et al, 1982;Deaf, 2009;Hieger et al, 2015;Souza-Lima and Silva, 2018;Deaf et al, 2020a).…”

Section: Paleoclimatementioning

confidence: 99%

Organic petrographic, geochemical, and sequence stratigraphic analyses for evaluating the hydrocarbon potential of Middle Jurassic–Lower Cretaceous rocks in Shushan Basin, northwestern Egypt

et al. 2023

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Integrated organic petrographic and geochemical analyses were made on organic-rich marine carbonate and mixed clastic-carbonate rocks of Middle–Late Jurassic and Early Cretaceous age from the Shushan Basin, Egypt to evaluate their hydrocarbon potential. Analyses allowed the identification of depositional settings, paleoclimate, and three third order genetic stratigraphic sequences (SQ) with deposits assigned to highstand (HST), lowstand (LST) and transgressive systems tracts (TST). Deposition of the source rocks in the rifting Shushan Basin resulted from the interaction between Neotethyan sea level changes, tectonic, and climate. The good reducing conditions developed during the Neotethyan Middle–Late Jurassic (Bajocian–Kimmeridgian) second order sea level rises and the climatically induced carbonate sedimentation resulted in the deposition of the organic-rich carbonates of the Khatatba Formation (SQ 1, early–middle TST) in inner–middle shelf settings under anoxic–dysoxic conditions. The Late Jurassic (late Kimmeridgian) uplifting resulted in the deposition of the organic-lean mixed clastic–carbonate strata of the Masajid Formation (SQ 1, latest TST) in the same shelfal and reducing conditions, which experienced a notable dilution of organic matter. The late TST deposits of SQ 1 are good to very good oil-producing source rocks, where they show average good to very good generative potential of late mature (late oil-to early wet gas-window) highly oil-prone organic matter. The Early Cretaceous (Valanginian–Albian) uplifting associated with the rifting of the Shushan Basin overprinted the Neotethyan late Valanginian–Hauterivian second order sea level rises, Aptian second order highstand sea level, and Albian second order sea level rise. The coeval climatic shift toward more humid conditions resulted in the clastic-dominated deposition of the organic-lean regressive units of SQ 2 (HST and LST of Alam El Bueib, Alamein, and Dahab formations) and SQ 3 (HST and LST of the lower–upper Kharita Formation) in marginal marine settings under anoxic–dysoxic to oxic conditions. The HST and LST deposits of the SQ 2 and SQ 3 show poor to good organic richness of early–mid mature (early–peak oil-window) oil/gas-prone and gas/oil-prone organic matter, respectively and exhibit average fair oil source rock potential with no gas generation.

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“…A paleoflora da Formação Barbalha é caracterizada quase que exclusivamente por evidências palinológicas (LIMA, 1978;PERINOTTO, 1984;COELHO, 2001;COIMBRA et al, 2002;DE MORAES et al, 2012;SOUZA-LIMA;SILVA, 2018;GOLDBERG et al, 2019), sendo que a maioria de seus achados são concentrados nas "Camadas Batateira", que pertencem ao final da sequência inferior da Formação Barbalha . Seu conteúdo palinológico posiciona a Formação Barbalha na biozona P-270 de idade neoaptiana (HASHIMOTO et al, 1987), pela presença do pólen de Sergipea variverrucata, importante marcador temporal do Aptiano -cerca de 125 milhões de anos atrás (REGALI et al, 1986;.…”

Section: Riqueza Paleontológicaunclassified

“…Quando o estudo se refere a vegetação que se desenvolveu no início do estágio postrift I a grande maioria corresponde à microfósseis (LIMA, 1978;PERINOTTO, 1984;COELHO, 2001;COIMBRA et al, 2002;SYRIO;RIOS-NETTO, 2002;DE MORAES et al, 2012;SOUZA-LIMA;SILVA, 2018;GOLDBERG et al, 2019) e somente poucos retratam a macroflora (DE LIMA et al, 2021), como constatado nessa revisão sobre a Formação Barbalha.…”

Section: Considerações Finaisunclassified

Paleontologia - Estado Da Arte Da Formação Barbalha (Grupo Santana) Da Bacia Do Araripe, Nordeste, Brasil

Rebelato

Alves²,

Lima³

et al. 2022

Estudo & Debate

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A Bacia do Araripe é conhecida mundialmente por sua diversidade de fósseis em excelente estado de conservação, que registram a fauna e a flora do Paleozoico ao Mesozoico, depositados durante milhões de anos. A vasta literatura sobre a bacia é concentrada em sua maioria sobre o Mesozoico, com especial interesse ao Grupo Santana, cujo estratos aflorantes são do período Cretáceo, podendo conter lacunas entre seus diferentes sistemas deposicionais. O presente artigo tem como objetivo realizar uma revisão bibliográfica sobre a Formação Barbalha fornecendo o estado da arte e seus gargalos que corresponde a base deste grupo. As bibliografias analisadas indicaram uma predominância de estudos de natureza geológica e uma escassez de trabalhos paleontológicos. Dentre os estudos paleontológicos, a maioria ocorre com microfósseis e a minoria com paleoflora. A carência de estudos fossilíferos para a Formação Barbalha pode estar relacionada aos processos de fossilização, os quais estão diretamente relacionados aos interesses dos pesquisadores em estudar as demais formações, devido a maior qualidade de seu registro fóssil.

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Aptian–Albian paleophytogeography and paleoclimatology from Northeastern Brazil sedimentary basins

Cited by 14 publications

References 75 publications

Late Aptian paleoclimate reconstruction of the Brazilian equatorial margin: inferences from palynology

Late Aptian paleoclimate reconstruction of the Brazilian equatorial margin: inferences from palynology

Organic petrographic, geochemical, and sequence stratigraphic analyses for evaluating the hydrocarbon potential of Middle Jurassic–Lower Cretaceous rocks in Shushan Basin, northwestern Egypt

Paleontologia - Estado Da Arte Da Formação Barbalha (Grupo Santana) Da Bacia Do Araripe, Nordeste, Brasil

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